Add files via upload
Add files via upload

Fixes:

- ["remove reference to IRC"](https://github.com/aturley/pony-cheatsheet/issues/1)
- ["add reference to Zulip group"](https://github.com/aturley/pony-cheatsheet/issues/2)
- ["remove text that shows that you can set the refcap for an actor"](https://github.com/aturley/pony-cheatsheet/issues/3)
- ["Show how to add a docstring"](https://github.com/aturley/pony-cheatsheet/issues/4)
- ["change urls with ponylang.org to ponylang.io"](https://github.com/aturley/pony-cheatsheet/issues/5)
ponylang/ponylang.github.io